| London to Orbetello | 821.71 mi (1,322.41 km) |
| London to Oria | 1,136.89 mi (1,829.65 km) |
| London to Oristano | 903.78 mi (1,454.50 km) |
| London to Orta Nova | 1,027.22 mi (1,653.15 km) |
| London to Orte | 857.13 mi (1,379.42 km) |
| London to Ortona | 929.73 mi (1,496.26 km) |
| London to Orvieto | 834.45 mi (1,342.92 km) |
| London to Orzinuovi | 623.96 mi (1,004.17 km) |
| London to Osimo | 840.85 mi (1,353.22 km) |
| London to Ospitaletto | 621.03 mi (999.46 km) |
| London to Ostuni | 1,123.21 mi (1,807.63 km) |
| London to Ottaviano | 1,011.45 mi (1,627.77 km) |
| London to Ovada | 623.02 mi (1,002.65 km) |
| London to Ozieri | 870.96 mi (1,401.68 km) |
| London to Paceco | 1,119.05 mi (1,800.93 km) |
